#__*__coding:utf-8__*__
#python3
from tkinter import *
import random
import time

class Ball:#小球的类 
	def __init__(self,canvas,paddle,color):
		self.canvas=canvas  #传递画布值
		self.paddle=paddle  #把挡板传递进来
		self.id=canvas.create_oval(10,10,35,35,fill=color)#画椭圆并且保存其ID
		self.canvas.move(self.id,245,100)
		start=[-3,-2,-1,1,2,3]
		random.shuffle(start)#随机化列表
		self.x=start[0]
		self.y=-3
		self.canvas_heigh=self.canvas.winfo_height()#获取窗口高度并保存
		self.canvas_width=self.canvas.winfo_width()
	def draw(self):
		self.canvas.move(self.id,self.x,self.y)
		pos=self.canvas.coords(self.id)#返回相应ID代表的图形的当前坐标（左上角和右上角坐标）
		#使得小球不会超出窗口
		pad=self.canvas.coords(self.paddle.id)#获取挡板的坐标
		if pos[1]<=0 :
			self.y=3
		if pos[3]>=self.canvas_heigh or(pos[3]>=pad[1] and pos[2]>=pad[0] and pos[2]<=pad[2]):
			self.y=-3
		if pos[0]<=0:
			self.x=3
		if pos[2]>=self.canvas_width:
			self.x=-3
 
class Paddle:#挡板的类
	def __init__(self,canvas,color):
		self.canvas=canvas
		self.color=color
		self.id=canvas.create_rectangle(0,0,100,10,fill=color)
		self.canvas.move(self.id,200,300)
		self.canvas_width=self.canvas.winfo_width()
		self.l=0
		self.r=0

	def draw(self):
		pos=self.canvas.coords(self.id)
		if pos[0]<=0:
			self.l=0 
		if pos[2]>=self.canvas_width:
			self.r=0
	
	def turn_left(self,event):
		self.canvas.move(self.id,self.l,0)
		self.l=-20

	def turn_right(self,event):
		self.canvas.move(self.id,self.r,0)
		self.r=20
tk=Tk()
tk.title('Game')
tk.resizable(0,0)#使得窗口大小不可调整
tk.wm_attributes('-topmost',1)#包含画布的窗口放在其他窗口的前面
canvas=Canvas(tk,width=400,height=350,bd=0,highlightthickness=0)#后面两个参数去掉边框
canvas.pack()
tk.update()
paddle=Paddle(canvas,'blue')
ball=Ball(canvas,paddle,'red')

canvas.bind_all('<KeyPress-Left>',paddle.turn_left)#绑定方向键
canvas.bind_all('<KeyPress-Right>',paddle.turn_right)

while 1:
	ball.draw()
	paddle.draw()
	tk.update_idletasks()#快速重画屏幕
	tk.update()
	time.sleep(0.01)